Malicious PDF — malware analysis report

Static analysis result for SHA-256 d13f4ef821b68337…

MALICIOUS

PDF

78.2 KB Created: 2021-09-23 11:49:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 274caaf94b3c8b60ad441a90ca9e1849 SHA-1: ce3526bc59bcb376f76413c4a130878d45fcec14 SHA-256: d13f4ef821b68337bde86be9f251e6245964a1b09747eb6b8a93be702114702b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also hosts a large number of external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://veewood.com/file_media/file_image/file/32618364115.pdf In PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/75324122676.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dfe0e2193---34473980448.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/74525908336.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/mejefudunubiburoselisulu.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/96482ffcab1c87f3b0866bbcb1adeea0/20037699720.pdfIn PDF document text
    • https://fond.ru/userfiles/file/vizedizokezotakarisedu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161410d69d886b---xapolebub.pdfIn PDF document text
    • https://cungcapthitdetuoi.com/app/webroot/files/images/pages/files/30452669489.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/bunaruxenexakiw.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/peganuriwosawibeleg.pdfIn PDF document text
    • http://gamecoast.by/uploads/files/xituwewawosuj.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/betamagapewoxanexisulur.pdfIn PDF document text
    • http://pnlestari.com/visitbali/image/files/56599436651.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f70150b3825cc11ae0063f5d9716ebdc/gonomawovesiz.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/43773010867.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/44851238661.pdfIn PDF document text
    • http://schokofontaene.de/idata/85092693840.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/laxunofipofifodijapepano.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/nebegovifaxedonilatera.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/66128854133.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/puvazedujijekenenememuwo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=es+file+explorer+pro+alien+mod+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ceec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEEC 10736 bytes
SHA-256: 5c8af5c2b37e5ef67c8bd6d3386818ff679fbe66aff7f5e208ae061e315aed91
font_01_sfnt_off0000e782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE782 16828 bytes
SHA-256: c66546119ae1b1f98d88e7b745590d2fb04ec8a4784a556c7e4638d139a11408
font_02_sfnt_off00011300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1